Was looking to get an ID for this rifle I came across. Has good markings. "Harpers Ferry" behind the hammer. "JCB" on the muzzle. American Eagle stamped in from of the hammer. "P" carved into the stalk. "1852" below "Harpers Ferry".

Basically, I want to know what kind of rifle this is, anything that might be interesting about it (with Harpers Ferry printed on the side, it's history could be really interesting!), and if possible, what it might cost?

By the way, my knowledge of guns and rifles is supremely limited, so I may not know what I am talking about hehe.